Across
1
Glass that splits light into spectrum
4
Substance with pH above 7
6
Force that attracts objects together
7
Solid with repeating atomic pattern
9
Hottest planet in solar system
12
Our home planet
Down
2
Molten rock beneath Earth surface
3
Blocking of light by a celestial body
5
Magnetic metallic element
8
Ball of burning gas in space
10
Center of an atom or cell
11
Icy body with a tail near the sun